... calculate the distance, the area, the perimeter, the heart rate, and the pregnant week (five ways: BPD, GS ... .0MHz/3.5MHz/4.0MHzCalculation: distance, perimeter, area, heart rate, pregnancy week (BPD, GS, CRL, FL, AC) ... SVGA video output may mate with SVGA color monitor. And 2 groups of PAL video output ... may mate with PAL monitor, video image recording instrument and image workshop, ...